A203604 - OEIS

A203604

Number of nX2 0,1 arrays with adjacent row and column sums unequal

2, 8, 20, 44, 116, 332, 900, 2268, 5716, 14892, 39268, 101820, 260532, 668300, 1727812, 4469404, 11506196, 29540332, 75933220, 195497084, 503093108, 1292802636, 3320226820, 8530094940, 21919963604, 56309625260, 144586811108

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 2 of A203610

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for 4X4

..0..0....1..0....0..0....1..1....1..0....1..1....0..1....1..1....1..0....1..1

..1..0....1..1....1..0....0..0....0..0....0..0....0..0....1..0....1..1....1..0

..0..0....1..0....1..1....0..1....1..0....0..1....0..1....1..1....0..0....1..1

..1..1....1..1....0..0....1..1....0..0....0..0....1..1....1..0....1..0....1..0

CROSSREFS

Sequence in context: A165751 A131128 A296954 * A240940 A066857 A146168

Adjacent sequences: A203601 A203602 A203603 * A203605 A203606 A203607

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2012

STATUS

approved